Apparatus for slitting screws.



D.'MILLINGTON 6L C. MNTHE.

AlfPARATUS FOR SLITTING SOREWS.

APPLIoATIoN FILED JULY '1, 1910.

Patented Apr. 4, .1911.

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.D. MILLINGT-ON 8 o. MUNTHE. APPARATUS FOR `SLITTING SUREWS.

APPLIOATION FILED JULY 7, '191`o.

Patented Apr.4, 1911.

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D. MILLINGTON & c.' MUNTHE.

APPARATUS FOB SLITTING SOREWS.V

APPLICATION FILED JULY 7, 1910.

Patented Apr.4, 1911.

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APPARATUS FOR SLI'ITING SGRBWS. 'APPLIoATIoN FILED JULY 7, 1910.

988,802'. Patented Apr.4, 1911.

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APPARATUS FOB SLITTING SORBWS.

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Patented Apr. 4, 1911.

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APPARATUS FOR SLITTING SGRBWS. APPLI'UATION FILED JULY '1, 1910.

Patented' Apr. 4, 1911.

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UNITED STATES PATENT OFFICE.

DAVID MILLINGTON AND CHRISTOFFER MUNTHE, OF FRIEDENAU, NEAR BERLIN,

GERMANY.

APPARATUS FOR SLITTING SCREWS.

Specification of Letters Patent.

Application filed July 7, 1910.

To all whom it may concern:

Be 1t known that we, DAVID MILLING'roN and CI-Inrs'rorrnn MUNTHE,subjects of' thc King of Great Britain and the King of Norway,respectively, and residents of Friedenau, near Berlin, Germany, haveinvented certain new and useful Improvements in Apparatus for SlittingScrews, of which the following is a specification.

This invention has for its object to provide an improved apparatus forslitting screws and the like articles, specially designed for use withturret lathes and the like machines.

In the improved apparatus the screw which is to be slit, is moved atright angles to its own axis parallelly to the plane of the slittingsaw. This affords the advantage that the slit is made of uniform depththroughout its length. For this purpose the device for holding thescrew, hereinafter called the holder, is fixed in a slide which receivesup-and-down movement from the main drive of the lathe and is movedtangentially past the slitting saw.

One form of this invention is illustrated in the accompanying drawings,in which Figure 1 is a front elevation of the improved apparatus; F ig.2 is a section on the line A--B of Fig. 1; Fig. 3 is a section on theline C--D of Fig. 2; Figs. 4: and 5 illustrate details of the improvedapparatus; Fig. 6 is a front elevation of the slide-o erating mechanismwith the holder; Fig. is a side elevation thereof; and Fig. 8 is a rearelevation of the mechanism for driving the slitting saw.

As shown, 1 is the casing of the headstock of the lathe. On it is fixeda bracket 2 which is provided in front with a slideway 3. In thisslideway there works a slide 4 which carries at its lower end a holderhaving the form of tongs for receiving the screw as it is parted fromthe work. The lower arms of the holder are preferably provided withremovable jaw liners for the purpose of enabling the holder to beadapted to different diameters of screws to be slit. A spring 6 pressesthe upper arms 7, 7 of the holder apart, and thus keeps the holderpermanently in the closed state. Each of the two arms 5 of the holder isprovided at its upper end with a spring stud 8. These studs 8 bearagainst the surface 9 when the holder is closed. As soon as the holderis opened,

the studs snap into a recess 10 in the slide 11 and thus keep the holderin its open position. lVhen a screw is finished and cut off from thebar, and is held in the holder 5, the slide l is moved upward. By thismeans the screw is carried past the circular saw 12 which cuts a slit inthe head of the screw. Just before the slide l has reached the top ofits stroke, the two upper ends 7, 7, of the holder strike against a camstop fixed to the bracket -2 by the inclined surfaces of which they areforced toward each other in opposition to the tendency of the spring 6,so that the holder now releases the finished screw and allows it to dropon to the chute 15 which conveys it into a receiver. As the ends 7 ,7 ofthe holder move toward each other, the studs 8 move over the recess 10of the slide 11, into which they are caused' by the spring 16 to snapand thus keep the holder in its open state. During the downward movementof the slide, the holder remains in its open state until a stop 17strikes against a stop 18. In this movement the slide 11 is moved by arod 19 in opposition to the spring 2O in such a manner as to press bymeans of the inclined surface 21 the studs 8 back into the arms 7, 7',which, being then acted upon by the spring 6, act to close the holder.This closing of the holder must be effected at the moment when theholder is on a level with the screw which it is to receive, the stop 18being made adjustable for that purpose.

The slitting saw is mounted in an eccentric brush or sleeve 22, so thatby turning the latter on its axis the saw can be moved toward or awayfrom the holder containing the screw to be slit. The slitting saw isdriven directly from the main shaft 23 of the lathe which also drivesthe drum shaft 24. For this purpose the main shaft'23 is extended overthe worm 25 by which the drum shaft is driven, and it is provided at itsupper end with a second worm 26 which gears with a worm wheel 27 mountedon the spindle of the circular saw. In the example shown, the main shaftis provided with a ball and socket joint 28, but this latter is notabsolutely necessary, because the main shaft may be connected by meansof a flexible shaft with the worm 26. Since the spindle 16x of thecircular saw 12 is shifted by turning the eccentric bush 22, it isnecessary to shift also the worm wheel 26 which The upward and downwardmovement of.

the slideI is derived from a cam 29 which is mounted' on the drum shaft,and coperates with a rocking lever 30 pivoted to the frame of themachine. For this purpose this lever is provided with a roller 3lsliding over the cam. The free end of the lever 30 carries a rod 82kprovided with teeth 33 that engage a wheel 34 iXed on the shaft 35. Onthis shaft 35 is fixed a second toothed wieel 36 gearing with a rack 37on the slide. As the rocking lever 30 is moved up and down by the cam,the toothed wheel 86 will be rotated to a corresponding extent, and willcause the slide 4 that carries the holder 5, to move up and down aswell. This arrangement aifords the advantage that the up and downmovement of the holder is produced by positive means, and can beregulated quite independently of the speed of revolution vof the drumshaft to suit the particular purpose in view, so that,

'for instance, the holder can readily be caused to move down slowly.

When it is desired to cut two slits in the head of the screw or to cutflats on two sides of the screw, two saws may be ar ranged side by side,instead of only one saw, without e'ecting the nature of the invention inany way.

We claim:

l. In combination in apparatus of the class described, a saw member, aholder for the screw, a slide carrying said holder and movable in aplane parallel or coincident with the plane of the saw member andtangential to the edge of said saw member, said slide having teeththereon, a toothed wheel meshing with said teeth, a cam means wherebythe same is driven from the drum shaft of the lathe to which theapparatus is quickly and move up applied, and a rack and pinionconnection between the cam and the toothed wheel, substantially asdescribed.

2. In combination in apparatus of the class described, a saw member, aholder for the screw consisting of a pair of pivoted arms having jawsfor engaging the screw, a reciprocating slide carrying the said holder,cam means on the frame for engaging the arms of the holder for openingthe jaws, detent means for holding the jaws in open position, and meansfor releasing the detent means for the closing of the jaws when theholder moves downwardly, substantially as described.

3. In apparatus of the class described, the combination of a saw member,a holder. comprising a pair of spring pressed pivoted arms having awsfor engaging the screw, a reciprocating carrier for the holder, detentmeans for holding the aws of the holder in open position, and asupplemental slide on the main slide with means for operating ythe sameto release the detent means and permit the jaws of the holder to close,substantially as described.

a. In combination in apparatus of the class described, a saw member, apair of spring pressed pivoted aws, a slide carrying the said jaws, adetent for each jaw, cam means lfor opening the jaws as the slide movesaway from the saw, a supplemental slide on the main slide with which thedetents engage for holding the jaws open, and

stops, one on the main slide and one on the frame, the stop of the slidebeing movable and connected with the supplemental slide for'operatingthe same to Vrelease thedetent for closing of the jaws, substantiallyaside-- scribed. y

ln testimonywhereof, we aiiix our signatures in presence of twowitnesses.

DAVID MILLINGTON. CHRSTOFFER MUNTHE.

litnesses VOLDEMAR HAUPT, HENRY Hasrnn.

Copies of this patent :may be obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, J). C.

